ANC Activism
He joined the ANC in 1940. In 1943, together with Nelson Mandela and Oliver Tambo, he joined the ANC Youth League, founded by Anton Lembede, of which he was initially the treasurer. He later distanced himself from Lembede after Lembede (died 1947) had ridiculed his parentage (Sisulu was the son of a white foreman). Sisulu was a brilliant political networker and had a prominent planning role in the militant Umkhonto we Sizwe ("Spear of the Nation"). He was made secretary general of the ANC in 1949, displacing the more passive older leadership, and held that post until 1954. He also joined the South African Communist Party.
As a planner of the Defiance Campaign from 1952, he was arrested that year and given a suspended sentence. In 1953, he travelled to Europe, the USSR, Israel, and China as an ANC representative. He was jailed seven times in the next ten years, including five months in 1960, and was held under house arrest in 1962. At the Treason Trial (1956–1961), he was eventually sentenced to six years, but was released on bail pending his appeal. He went underground in 1963, resulting in his wife being the first woman arrested under the General Laws Amendment Act of 1963 (or "90-day clause"). He was caught at Rivonia on 11 July, along with 16 others. At the conclusion of the Rivonia Trial (1963–1964), he was sentenced to life imprisonment on 12 June 1964. With other senior ANC figures, he served the majority of his sentence on Robben Island.
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